Idk why anyone would want to put the selection of senators in fewer hands (SS). Awful idea.
The Founders, who generally were pretty bright, wanted that, obviously (which doesn't make it right or wrong). Initially, the voting public (white, over 21, male, property owners generally) only voted directly for the House. Our Founders feared pure democracy about as much as monarchy. They wanted checks and balances, in large part to secure the rights of minority positions. And of course technically we still elect Presidents in very very few hands, a lot of folks would like to change that too.
I have no real position on 17, it's fine with me, it's not going to change obviously, so I don't sweat it except perhaps as a thinking exercise.
The country overall does change, the various Amendments are examples of that, and a new Amendment is a tough lift, and means most folks favor it. We're not going to see new Amendments in my lifetime, I suspect, term limits are out for obvious reasons, we're not going to alter 2A, a Balanced Budget Amendment won't happen, the Women's ERA won't happen, I can't think of anything else remotely possible.
Maybe that is because so many folks think everything is Perfect already.